. Two regular polygons are such that the ratio between their number of sides
is 1 : 3 and the ratio of the measures of their interior angles is 3 : 4. Find the
number of sides of each polygon.
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Answer:
Let number of sides of two polygons are n and 2n
measures of interior angles of x sided regular polygon is
x
(x−2)×180°
so
n
n−2
×180°
2n
2n−2
×180°
=
3
4
⇒
2(n−2)
2n−2
=
3
4
⇒6n−6=8n−16
⇒2n=10
⇒n=5
Therefore, number of sides of polygon are 5 and 10.
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